diff --git a/ext/standard/crypt_freesec.h b/ext/standard/crypt_freesec.h
index 22c391a3ef0..a87663d4fea 100644
--- a/ext/standard/crypt_freesec.h
+++ b/ext/standard/crypt_freesec.h
@@ -5,6 +5,9 @@
 
 #if PHP_WIN32
 # include "win32/php_stdint.h"
+# ifndef inline
+# define inline __inline
+# endif
 #else
 # include "php_config.h"
 # if HAVE_INTTYPES_H